Quid has various meanings:
A pound sterling (Ā£), in British slang, possibly derived from the Royal mint at Quidhampton, Wiltshire, England, but more likely from the Latin phrase 'Quid Pro Quo' (This for that)meaning an exchange of goods.
A euro (?), in Irish slang
An Irish punt or Australian pound (no longer issued)
Quid , a French encyclopedia
Quantitative Ingredient Declaration (QUID) On Food Labellinghttp://www.cspinet.org/reports/codex/quidonlabelling.pdf
An abbreviation of the Latin "tertium quid", meaning "third party" and used to denote an anti-Madison part of the Democratic-Republican Party of the United States between 1805 and 1811.
A rolled up cylinder of fresh leaves to be chewed and held in the mouth for medicinal or other effects.
A Quasi Universal Intergalactic Denominationhttp://news.bbc.co.uk/1/hi/business/7029564.stm